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On Thursday, Apple announced some of the headlining acts that will perform at this year's iTunes Festival in London. Among the artists confirmed so far are Justin Timberlake, Thirty Seconds to Mars, Jack Johnson and Jessie J.

If you can't make it to the event, you're still in luck. Performances can be watched live or on-demand by iOS users on their iPhone, iPad or iPod touch. Individuals with iTunes on their computer or with an Apple TV can watch too.

Tickets are free for competition winners only, Apple says.

Music fans from across the world, including the US, Australia, Brazil, Canada, Europe, Japan and Mexico can win tickets to the iTunes Festival through competitions run by local media partners. In the UK, fans can win tickets using the iTunes Festival app and the iTunes Store® as well as select media partners including Channel 4, Global Radio and Metro.

“This year’s iTunes Festival is the best ever with an incredible lineup of global superstars and stellar emerging artists,” says Eddy Cue, Apple’s senior vice president of Internet Software and Services. “Music fans around the world are going to love watching this incredible month of music, whether in London at the Roundhouse or on their iOS device. We’re honored so many renowned artists are part of this year’s lineup.”